tine is an open-source groupware suite for collaboration within companies and organisations. It includes a calendar with recurring appointments and resource planning, an address book, email, tasks, a file manager, project time tracking and CRM. Clients can connect through ActiveSync, WebDAV, CalDAV and CardDAV. The software runs on PHP with MySQL or MariaDB. Organisations can install tine themselves, including through OCI images on Docker Hub, or use it as SaaS.
tine is developed by METAWAYS Infosystems GmbH in Hamburg, Germany, and is released mainly under the AGPLv3. The name is a registered trademark. According to the company's website, the SaaS variant is run by Metaways itself, with server locations in Hamburg; anyone installing tine independently is responsible for operating the server. Both options let a European organisation choose between a German service provider and full control over its own infrastructure.